Tried for the first time today, about 3 hrs ago after a night with only 4 hrs sleep. No jitters, no upset stomach like the usual large amounts of coffee I drink give. Seems subtle however I feel really good! Alert, in a good mood, feel like a got a good nights sleep! Tastes like childs grape coug...

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I didn't like the new formulation as much as Original Stack, which I now take (although I know it is to be discontinued)

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This product worked very well for me! I had great energy (with no jitters), clear thinking and I even slept better! Perhaps that’s because of the activity I was able to do or some of the ingredients I the product. Very impressed!!

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more productive

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